11906561 has 2 divisors, whose sum is σ = 11906562. Its totient is φ = 11906560.

The previous prime is 11906551. The next prime is 11906567. The reversal of 11906561 is 16560911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9265936 + 2640625 = 3044^2 + 1625^2 .

It is an emirp because it is prime and its reverse (16560911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11906561 - 2⁶ = 11906497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11906567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5953280 + 5953281.

It is an arithmetic number, because the mean of its divisors is an integer number (5953281).

Almost surely, 2^11906561 is an apocalyptic number.

It is an amenable number.

11906561 is a deficient number, since it is larger than the sum of its proper divisors (1).

11906561 is an equidigital number, since it uses as much as digits as its factorization.

11906561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 11906561 is about 3450.5885005315. The cubic root of 11906561 is about 228.3470719470.

The spelling of 11906561 in words is "eleven million, nine hundred six thousand, five hundred sixty-one".